[Gfoss] help on unsupervised classification

[Pietro Arena]

Dopo aver effettuato le seguenti operazioni:
*-r.in.gdal -o input=1313-31.tif output=result*
-*r.composite red=**result**.red green=**result**.green blue=**result**.blue
levels=32 output=result_composite*
*
*
Ho settato *g.region rast=result_composite* e ho creato il group con* **i.group
group=gruppo subgroup=sottogruppo input=result.blue,result.green,result.red
*

A questo punto ho avviato la clusterizzazione. *i.cluster group=gruppo
subgroup=sottogruppo sigfile=sign classes=5 * restituisce il seguente
errore:
*ERRORE: Not enough non-zero sample data points. Check your current
region(and mask).*
*
*
*Ecco alcuni dati:*
*g.region -p:                                                   *
projection: 99 (Transverse Mercator)
zone:       0
datum:      rome40
ellipsoid:  international
north:      4790000
south:      4788000
west:       503000
east:       506000
nsres:      0.5
ewres:      0.5
rows:       4000
cols:       6000
cells:      24000000

*r.univar result.blue*:
total null and non-null cells: 2400000
total null cells: 0

Of the non-null cells:
----------------------
n: 240000000
minimum: 27
maximum: 255
range: 228
mean: 178.426
mean of absolute values: 178.426
standard deviation: 61.3704
variance: 3766.32
variation coefficient: 34.3955 %
sum: 4282213312

*r.univar  result.red:*
total null and non-null cells: 24000000
total null cells: 0

Of the non-null cells:
----------------------
n: 24000000
minimum: 47
maximum: 255
range: 208
mean: 150.578
mean of absolute values: 150.578
standard deviation: 84.7223
variance: 7177.87
variation coefficient: 56.2647 %
sum: 3613877038

*r.univar result.blue:*
total null and non-null cells: 24000000
total null cells: 0

Of the non-null cells:
----------------------
n: 24000000
minimum: 65
maximum: 255
range: 190
mean: 168.196
mean of absolute values: 168.196
standard deviation: 69.9572
variance: 4894.01
variation coefficient: 41.5927 %
sum: 4036702319

*r.univar result_composite:*
total null and non-null cells: 24000000
total null cells: 0

Of the non-null cells:
----------------------
n: 24000000
minimum: 3340
maximum: 32767
range: 29427
mean: 22889.7
mean of absolute values: 22889.7
standard deviation: 7924.55
variance: 6.27985e+007
variation coefficient: 34.6205 %
sum: 549353728516

-- 
Pietro Arena
-------------- parte successiva --------------
Un allegato HTML ? stato rimosso...
URL: <http://lists.gfoss.it/pipermail/gfoss/attachments/20110610/9cfc0c9d/attachment-0001.html>